3.0.28: Bugfix in IOPCItemProperties, .NET4 support. 3.0.27: Bugfix in IOPCAsyncIO2.Write 3.0.26: 64-bit version bug fixes 3.0.25: 64-bit pointers can be used for user Tag ID; can set number of async requests 3.0.24: OPC service example added 3.0.23: